Authorities Were on High Alert for Possible Hijack Attempt

The arrests of two men in Amsterdam for questioning in a terrorism investigation comes at a time U.S. law enforcement officials have been on a heightened state of alert to a possible hijacking of U.S. carrier flights from the Middle East, according to one senior U.S. official. In response , in the past several weeks, authorities have greatly ramped up the number of Federal air marshals on overseas flights, especially to Dubai, the official said.